LTC3557 Datasheet, PDF (27/28 Pages) Linear Technology – USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

LTC3557/LTC3557-1
TYPICAL APPLICATION
HV_IN
8V TO 38V
(TRANSIENTS
TO 60V)
4.7μF
4
V_IN
2
BOOST
68nF _150k
LT3480
5
3
RUN/SS SW
10
R_T
40.2k
6
NC
SYNC
7
NC
PG
1
BD
8
FB
GND V_C
11
9
OPTIONAL HIGH VOLTAGE
BUCK INPUT
0.47μF _6.8μH
DFLS240L
499k
22μF
100k
Si2333DS
USB OR
5V WALL
ADAPTER
26 3 25
10μF
V_C WALL ACPR
24
23
V_BUS
V_OUT
6
BV_IN1
2.1k ₂₇
16
CLPROG BV_IN2
2k ₂₀
PROG
CHRG ²⁸
21
GATE
100k ₁₈
V_NTC
22
BAT
100k
NTC
19 _NTC
4
LDO3V3
LTC3557/
LTC3557-1
PMIC
CONTROL
1
ILIM0
2 _ILIM1
9 _EN1
10 _EN2
11 _EN3
8 _MODE
5
SW1
7
FB1
17
SW3
12
FB3
14
RST2
15
SW2
13
FB2
GND
29
10μF
2.2μF
2.2μF
510Ω
V_OUT
Si2333DS
(OPT)
3.3V
25mA
+
BAT
Li-Ion
1μF ^{ALWAYS ON}
3.3μH
4.7μH
10pF 1.02M _324k
10pF 806k _649k
V_OUT1
3.3V
10μF ^600mA
V_OUT3
1.8V
10μF ^400mA
4.7μH
100k
10pF 232k _464k
RST2
V_OUT2
1.2V
10μF ^400mA
35571 TA02
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
35571fc
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